There are many ways of being able to do this. One way, (and the way I use) is through telegram. Telegram is actually a messaging app. It is available on pc and phone. It also allows you to send a message to yourself and access it on phone and pc. Telegram Link: https://telegram.org/ . Another way of doing this, which is is a bit more complicated, is through Discord. Discord does not allow you to send messages to yourself but you can create a server and just post things there. Discord Link: https://discord.com/ .
Both of these ways are easy and good. I prefer Telegram, but both are basically the same. In both of them all you need is to upload the image.